[libvirt] [PATCH 0/4] Take 3 - Patchset to avoid uid problems in volume creation

The last iteration of this work (which is now completely obsoleted) is at https://www.redhat.com/archives/libvir-list/2010-January/msg00302.html These patches are intended in particular to deal with problems creating storage volumes on pools that are located on root-squashing NFS servers, but hopefully they are overall just "a good thing" and will solve other as-yet-unencountered/unreported problems. Differences from previous version of the patches: 1) For completeness, chmod is done inside virFileCreate and virDirCreate as well as setting uid and gid. 2) Both of those functions now take an additional flag - VIR_FILE_CREATE_ALLOW_EXIST, which does exactly what you'd think. 3) I now always attempt to set uid/gid correctly, even if not running as root (per Serge Hallyn's suggestions during the last go around) 4) I've added a patch that uses similar logic to get the uid/gid/mode of the directories for newly created pools correct as well. (Previously, we'd been ignoring the permission bits of pool definition xml).